Genetic distance and Diversity among some Cowpea (Vigna unguiculata L. Walp) genotypes

Adewale, B. D. and Adeigbe, O. O. and Aremu, C. O. (2011) Genetic distance and Diversity among some Cowpea (Vigna unguiculata L. Walp) genotypes. International Journal of Research in Plant Science, 1 (2). pp. 9-14.

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Diversity analysis has been a fundamental protocol for crop improvement; it unravels the genetic potentials of genotypes. Nine breeding lines of cowpea and a common cowpea cultivar were evaluated in a randomized complete block design. The phenotypic traits measured includes: plant height at 4 weeks, number of pods per plant, pod length, number of days to first flower, number of days to first ripe pod, number of peduncles per plant, peduncle length and number of branches per plant. The ten cowpea differed significantly (P ≤ 0.001) from each other for the eight phenotypic traits. 24881-2 significantly (P ≤ 0.05) produced more pods than Ife-brown. However, days to first flowering and pod ripening were significantly (P ≤ 0.05) lower in Ife-brown than 24881-2. The mean Euclidean distance between the genotypes was 3.7479, the least (0.9494) was between 25016-2 and 24901-1 and the highest (6.4590) was between 24884-1 and 24881-2. The coefficient of variation for the phenotypic traits ranged between 5.51(days to first pod ripening) and 105. 63 (number of branches per pod). The first three principal component axes explained 80% of the total variation. Two groups of genotypes distinctly evolved by the principal component analysis. Group I had genotypes with high pod productivity but late flowering and ripening. The genotypes in group II flowered and produced ripen pods much earlier. Selection of genotypes within the groups could facilitate a breeding programme for highly productive and early maturing cowpea genotypes.

Item Type: Article
Subjects: S Agriculture > S Agriculture (General)
Date Deposited: 19 Feb 2019 14:12
Last Modified: 19 Feb 2019 14:12

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